Ferromagnetic correlations in heavy fermions from an NMR point of view: YbNi4P2 vs. YbRh2Si2

被引：4
作者：
Baenitz, M. [1 ]
Sarkar, R. [1 ]
Khuntia, P. [1 ]
Krellner, C. [2 ]
Geibel, C. [1 ]
Steglich, F. [1 ]
机构：
[1] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany
[2] Goethe Univ Frankfurt, Inst Phys, D-60438 Frankfurt, Germany
来源：
PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 10, NO 3 | 2013年 / 10卷 / 03期
关键词：
heavy fermions; ferromagnetism; NMR; fluctuations; dynamic susceptibility; QUANTUM CRITICALITY; SPIN SUSCEPTIBILITY; PHASE-DIAGRAM; RELAXATION; NUCLEAR; ALKALI;
D O I：
10.1002/pssc.201200852
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ferromagnetic correlations are discussed on the basis of shift K-4f and spin-lattice-relaxation (SLR) rate R-4f (T) = (1/T1T)(4f) investigations for YbNi4P2 and YbRh2Si2. For YbRh2Si2 the coexistence of antiferromagnetic (afm) and ferromagnetic (fm) fluctuations at the edge of magnetic order is strongly related to the non-Fermi-liquid behaviour (NFL). The analysis of the NMR results for YbNi4P2 in the modified Korringa framework for correlated local moment metals yields the enhancement factor kappa(alpha) which is a measure of the q-space dependence of the complex dynamic susceptibility. Surprisingly the kappa(alpha) behavior of YbNi4P2 is very similar to YbRh2Si2 and evidences strongly the evolution of an afm (q not equal 0) component in the q = 0 dominated complex dynamic susceptibility chi ''(q,omega(n),T) at low temperatures and in small fields. This suggests the presence of ferro- and antiferromagnetic fluctuations at the QCP and the freezing out of the afm ones by applying magnetic fields and tuning towards FL state. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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页码：540 / 543
页数：4
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